Lexmark Z51 Color Jetprinter, Service Manual

Page: 24 / 70

2-12
Service Manual
4098-001
2 Paper Feed Motor A noisy or chattering motor or a motor that fails to
turn, can be caused by:
• An open or short in the motor
• An open or short in the motor driver on the
system board
• A bind in the paper feed mechanism
With the paper feed motor cable disconnected
from the system board, check for 3 to 5 ohms
between pin 1 and 4 on the motor cable.
If the reading is incorrect, replace the motor.
Check for motor pins shorted to the motor housing.
If you find a shorted pin, replace the motor. If the
failure remains, replace the system board.
Although the paper feeds in a forward direction
only, the paper feed motor turns in two directions.
If the paper feed motor turns in one direction only,
replace the system board.
Binds in the paper feed motor or gear train can
cause intermittent false paper jams. Remove the
paper feed motor and check the shaft for binds.
3 Drive Train
Assembly Check for binds in the gear train and paper feed
mechanism by removing the paper feed motor and
rotating the large gear by hand. If you notice a
bind, replace the drive train assembly. Also, check
the feed clutch inside the large feed gear.
4 Sheet Feeder Check all parts inside the sheet feeder for wear or
damage. Check the auto compensator pick roller
and pick pad for wear.
Run the “Print Test Page” on page 3-2 . A Paper
Test Result of greater than 5000 indicates there is
a drag on the pick mechanism. Check the pick
mechanism for binds. A Paper Test Result = 65535
indicates it failed to pick paper on the first try but
was successful on the second try. Check for a dirty
pick roller causing it to slip on the print media.
5 Mid Frame Asm Check the exit and star rollers for wear. Check the
exit drive belt for wear.
FRU Action